An apparatus for measuring bio-information may include a pulse wave sensor comprising at least one pair of light emitters which are disposed apart from each other and a light receiver disposed between the at least one pair of light emitters, the pulse wave sensor being configured to measure a plurality of pulse wave signals, in particular photoplethysmogram, PPG, signals, from an object by using the light receiver and the at least one pair of light emitters, in particular wherein the bio-information comprises at least one of blood pressure, blood glucose, cholesterol, vascular age, arterial stiffness, aortic pressure waveform, vascular compliance, blood triglyceride, cardiac output, total peripheral resistance, stress index, and degree of fatigue, a processor, and a force sensor configured to measure a contact force that is applied to the pulse wave sensor by the object, or a force distribution sensor configured to measure a contact force distribution of a contact force that is applied to a contact surface of the pulse wave sensor by the object and is distributed along the contact surface of the pulse wave sensor； wherein, if the apparatus comprises the force sensor, the processor is configured to generate an integrated pulse wave signal by integrating the plurality of pulse wave signals based on the contact force and an area of a contact surface of the pulse wave sensor, and estimate bio-information of the object based on the integrated pulse wave signal, or wherein, if the apparatus comprises the force distribution sensor, the processor is configured to generate an integrated pulse wave signal by integrating the plurality of pulse wave signals based on the contact force distribution, and estimate bio-information of the object based on the integrated pulse wave signal.
